<button class="radikalwp-btn-press3d">ثبت‌نام رایگان<//button>

.radikalwp-btn-press3d {
  padding: 13px 36px;
  font-family: inherit;
  font-size: 15px;
  font-weight: 800;
  color: #831843;
  background: #f9a8d4;
  border: none;
  border-radius: 12px;
  cursor: pointer;
  box-shadow: 0 5px 0 #db2777, 0 10px 20px rgba(219, 39, 119, .3);
  transition: transform .12s ease, box-shadow .12s ease;
}
.radikalwp-btn-press3d:active {
  transform: translateY(4px);
  box-shadow: 0 1px 0 #db2777, 0 3px 8px rgba(219, 39, 119, .3);
}